Latch for double-acting pumps.



Patented Mar. 6, 1917.

LATCH FORDOUBLE ACTING PUMPS.

APPLICATION FILED ocr. H. 1915.

H. C. WRISTEN & J. W. HENDERSON.

1,218,152. HZZZMJ 1] Witnesses 1m 7 w Attorneys an STATES .ra'rnnrenrich.

HENRY CLAY VIRISTEN AND JAMES WILLIAM HENDERSON, OF DEXTER, NEVJ MEXICO.

LATCH FOR DOUBLE-ACTING- PUMPS.

To all whom it'may concern:

Be it known that we, HENRY (l-Wius'rnrr.

and JAMES W. HENDERSON, citizens of. the

United States, residing at Dexter, in the county of Chaves, State of NewMexico, have invented a new and useful Latch for- Double-Acting Pumps,of which the following is a specification.-

The device forming the subject matter of this application is a means forlowering and holding a'pump within a well casing, the device being ofpeculiar utility in connection with a pump ofthat sort shown in our" No.12,368,.

and claimed, it being understood that. changes in the precise embodimentof the invention herein disclosed can be made within the scope of whatisclaimed, without departing from the spirit of. the invention.

In the accompanying. drawings Figure 1 shows in longitudinal section, a

double acting pump wherewith the latchmechanism forming the subjectmatter of this application has been assembled;

Fig. 2 is a side elevation of the latch mechanism and parts whereby thelatch mechanism is carried and actuated;

Fig. 3 is a section on the Fig. 2; 4

Fig. 4 is a section on the line M of Fig. 2;

Fig. .5 is an elevation of the la'tch mechanism, the structure beingviewed at right angles tothe showing of Fig; 2;

Fig. 6 is a plan showing the cross arm which constitutes a part of themeans for locating and holding in place the. foot valve.

In order that the nature and the operation of the present invention maybe clearly understood, there are shown in the drawings, sundry elementsconstituting a part of the double acting pump disclosed in our priorapplication Serial No. 12,368 .above Specification of Letters Patent.

Application filed October 15, 1915. Serial No. 56,123.

Patented Mar. 6 1917.

alluded to. .Those parts of the structure described in and covered byourearlier application will be'mentioned' bricfly, proper indication beingmade at the point where those elements giving novelty to the presentapplication appear.

' In the accompanying drawing, the numeral 1 indicates a well casingconstituting a pump barrel. Mounted to reciprocate toward and away fromeach other in the casing 1 are pistons 3 and 1 provided with upwardlyopening v.valves 8. 'Attached at its lower end to the piston'a is adouble rack bar 9 having opposed teeth 10, the rack bar 6 passingthrougha yoke 16 held in place in the well casing 1 by the latch mechanismforming the subject matter of this application. A pair of. opposed rods17 are slidably mounted in the piston 1,. the lower ends of the rodsbeing secured to the piston 3. The inner or adjacent edges of the rods17 are equipped with racks 22. The racks 22 and theteeth 10 of thedouble rack bar 9 mesh into gear wheels 24:, rotatably connected withthe yoke 16 by means of axles 25, the gear wheels 24 being locatedwithin the contour of the yoke 16.

' The foregoing details appear in our prior application above alludedto, and no novelty is claimed for them in this application,

saving-in so far as they may coact with elements to befdescribedhereinafter.

In practical operation, when the rack bar 9 is reciprocated,reciprocatingmotion will be transmitted to. the rods 17, the pistons 3and 4 being caused to approachand move away from'each other."

In carrying out the presentinvention, the sides of the yoke 16 areequipped with ears 2. Pivot elements 5are mounted in the ears line 33o-f i latches 6 beingmoun'ted'to swing on the 2 and in the side portionsof the yoke,

pivot elements, the latches being supplied adjacent their lower' endsand upon their outer edges with teeth? adapted to engage the well casing-1. Four. latches 6 are employed, and the latchesat the opposite sidesof the yoke 16 are connected witheach other by means of links 11, the.outer :ends of which are united with the latches by means of pivotelements 12, the inner ends of the links 11 being united by means ofpivot elements 14..

The double rack bar 9 carries an upper lug 15 and a lower lug 19. Theselugs if desired may be detachably united in the rack bar 9 and may beheld therein by set screws 20 or in any other suitable manner. The yoke16 preferably is bulged outwardly at the sides, as indicated at 50, soas to permit the lower lugs 19 to pass upwardly through the yoke andengage the lower edges of the links 11, for a purpose to be set forthhereinafter.

In practical operation, the pump is lowered into the well casing 1 tothe desired point, and then a forcible downward movement is given to therack bar 9, whereupon the lugs 15 thereof will engage with the links 11,forcing the same into alinement, and swinging the latches 6 outwardly,until the teeth 7 bite into or engage the well casing' 1.

When the rack bar 9 is moved upwardly, the lugs 19 will engage the loweredges of the links 11, thereby swinging the links upwardly and swingingthe lower ends of the latches (S inwardly, so that the teeth 7 of thelatches are freed from the well'casing. lt is to be understood, ofcourse, that during an ordinary stroke of the rack bar 9, the lugs 19and 15 do not coact with the links 11, such an operation taking placeonly when the bar 9 is given an unduly long stroke either upwardly ordownwardly. Previous to the mounting of the pump in the well in themanner hereinbefore described, the foot valve is seated in the bottom ofthe well casing 1. This portion of the structure embodies a platform 21on which is operatively mounted a foot valve 26. Secured to the platform21 is an arched, upwardly extended frame 27 having downwardly convergingarms 28, the frame 27 carrying a stem 29 threaded or otherwise adaptedto coa-ct with a tube or rod (not shown) whereby the valve structure maybe lowered to the desired point within the well casing. A cross arm: 30is provided, the same having notches 31 in its ends, the notches 31receiving the downwardly, converging arms 28 of the frame 27. In theextremities of the cross arm 30, elongated slots are formed, the samereceiving guide pins 33 mounted in the sides of jaws 3 51-. having teeth35 adapted to engage the well casing 1. An abrupt downward movement ofthe frame 27 will cause the arms 28' to coact with the jaws 3a, pushingthe same outwardly, and causing the platform 2 to be lodged firmlywithin the casing 1.

Having thus described: the invention, what is claimed is 1. In a deviceof the class described, a tubing; a: yoke adapted to be lowered into thetubing; a latch carried by the yoke and coacting with the tubing to holdthe yoke in the tubing; a piston structure slidable in the yoke andcoacting with the tubing; and interengaging elements on the pistonstructure and the latch to move the latch into casing engaging positionwhen the piston structure is moved a distance in excess of its normalmovement.

2. In a device of the class described, a tubing; a yoke adapted to belowered into the tubing; a latch carried by the yoke and coacting withthe tubing to hold the yoke in the tubing; a piston structure slidablein the yoke and coating with the tubing; and inter-engaging elements onthe piston structure and the latch to move the latch out of casingengaging position when the piston structure is moved a distance inexcess of its normal movement.

3. In a device of the class described, a tubing; a yoke adapted to belowered into the tubing; a latch carried by the yoke and coacting withthe tubing to hold the yoke in the tubing; a piston structure slidablein the yoke and coacting with the tubing; and interengaging elements onthe piston structure and on the latch coacting to move the latch intoand out of casing engaging position when the piston structure is movedin opposite directionsbeyond its normal scope.

l. In a device of the class described, a tubing; a yoke adapted to belowered into the tubing; a pair of latches pivotally carried by the yokeand coacting with the tubing to hold the yoke in the tubing; a flexibleconnection uniting the latches; a piston structure slidable in the yokeand coacting with the tubing; and projections on the piston structure,the projections being adapted to engage, respectively, with the upperand lower edges of the flexible connection.

5. In a de ice of the class described, a tubing; a yoke adapted to belowered into the tubing; latches pivotally carried by the yoke andcoacting with the tubing to hold the yoke in the tubing; a flexibleconnection uniting the latches; and'a reciprocating element havingspaced projections adapted to engage the upper and lower edges of theconnection, respectively, at different times.

In testimony that weclaim the foregoing as our own, we have heretoaffixed our signatures in the presence of two witnesses.

HENRY CLAY WRISTEN. JAMES WILLIAM HENDERSON.

Vitnesses HOWARD MIELENZ, AeNEs l/VHITMAN.

Copies of this patent may be obtained for five cents each, by addressingthe Commissioner of Patents,

' Washingtoml); O.

